Singapore shares closed higher on Monday, tracking regional gains as markets reacted positively to a US federal appeals court ruling that President Donald Trump's reciprocal tariffs were illegal.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,252.27 and 4,281.85 throughout the day. It ended the session at 4,276.07, up 6.37 points, or 0.2% compared with Friday's close.

In company news, shares of ASL Marine zoomed nearly 35% at the close as the company's attributable profit to owners surged 441% during the fiscal second half ended June 30 to SG$13.1 million from SG$2.4 million a year earlier.

YZJ Shipbldg SGD shares were up nearly 7% as it secured contracts worth $920 million during the first half of the year.

Meanwhile, CDL HTrust was up nearly 2% at the close after it rebranded Raffles Maldives Meradhoo as The Halcyon Private Isles Maldives, Autograph Collection, effective Nov. 1.